Dipole polarizability of a trapped superfluid Fermi gas
Dipole polarizability of a trapped superfluid Fermi gas
The polarization produced by the relative displacement of the potentials trapping two spin species of a dilute Fermi gas with N?=N? is calculated at unitarity by assuming phase separation between the superfluid and a polarized phase at zero temperature. Because of the energy cost associated with pair breaking, the dipole polarizability is strongly quenched and exhibits important deviations from the ideal gas behavior even for nonlinear displacements of the order of the size of the atomic cloud. The behavior in the presence of different trapping frequencies (monopole polarization) for the two spin species is also discussed. Our results suggest new experimental perspectives to explore the quantum phases of interacting Fermi gases
190403-[4pp]
Recati, A.
4f2a6759-f4f7-4bc7-819e-027ff21a56a5
Carusotto, I.
2205328f-fe28-4720-9283-c72e08e35800
Lobo, C.
cde7843a-c00b-4242-a8cd-1abb2dfe0703
Stringari, S.
76042105-4119-4bbd-9680-1b2314e497d9
November 2006
Recati, A.
4f2a6759-f4f7-4bc7-819e-027ff21a56a5
Carusotto, I.
2205328f-fe28-4720-9283-c72e08e35800
Lobo, C.
cde7843a-c00b-4242-a8cd-1abb2dfe0703
Stringari, S.
76042105-4119-4bbd-9680-1b2314e497d9
Recati, A., Carusotto, I., Lobo, C. and Stringari, S.
(2006)
Dipole polarizability of a trapped superfluid Fermi gas.
Physical Review Letters, 97 (19), .
(doi:10.1103/PhysRevLett.97.190403).
Abstract
The polarization produced by the relative displacement of the potentials trapping two spin species of a dilute Fermi gas with N?=N? is calculated at unitarity by assuming phase separation between the superfluid and a polarized phase at zero temperature. Because of the energy cost associated with pair breaking, the dipole polarizability is strongly quenched and exhibits important deviations from the ideal gas behavior even for nonlinear displacements of the order of the size of the atomic cloud. The behavior in the presence of different trapping frequencies (monopole polarization) for the two spin species is also discussed. Our results suggest new experimental perspectives to explore the quantum phases of interacting Fermi gases
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PhysRevLett.97.190403.pdf
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Published date: November 2006
Organisations:
Applied Mathematics
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Local EPrints ID: 205905
URI: http://eprints.soton.ac.uk/id/eprint/205905
PURE UUID: 5347671f-932b-47e4-8484-67562cffabf4
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Date deposited: 15 Dec 2011 09:23
Last modified: 15 Mar 2024 03:32
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Author:
A. Recati
Author:
I. Carusotto
Author:
S. Stringari
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